Is this sentence informal? Is this a kind of sentence you could use in formal writings as you hand in at school?
(1) It is careless of you having smoked in the building.
Which would you choose when you talk with your friend?
(2)It is careless of you to have smoked in the building.
It was most unthoughtful of you to have smoked/smoking in the building. (formal)
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Which would you choose when you talk with your friend?How could you be so careless as to smoke in the building?